field type file [Solved]

Hello
I use joomla 1.5 with flexicontent 1.5.4
I have a form to send items in the frontend.
In these form I created, in flexicontent, one template, one type and one category.
In these form there are a field type "file"
To send a item the user clic in the button of the file field.
It'w when appears a modal window.
I want to change the content of this modal window.
What are the files where are the content of this window? And the path?

Regards

.
Should be in here:
com_flexicontent_155_stable_r607\plugins\file\file.php

On the website that file should be here:
joomla_root/plugins/flexicontent_fields/file.php

.

Thanks,
Regards